Add missing functions get_ticks() and get_tbclk() in lib_m68k/time.c
* Patch by Paul Ruhland, 24 May 2004:
fix SDRAM initialization for LPD7A400 board.
- Add support for the Logic Zoom LH7A40x based SDK board(s),
specifically the LPD7A400.
* Patches by Robert Schwebel, 15 May 2004:
- call MAC address reading code also for SMSC91C111;
- make SMSC91C111 timeout configurable, remove duplicate code
- fix get_timer() for PXA
- update doc/README.JFFS2
- use "bootfile" env variable also for jffs2